Tatianists belong to the third or fourth century. The Tatian of the second century was a Platonic philosopher who wrote Discourses in good Greek; Tatian the heretic lived in the third or fourth century, and wrote very bad Greek. The two men were widely different in every respect, and the authority of the heretic for four gospels is of no worth.

FIFTH CENTURY: The Pelagians (Pelagius), Nestorians (Nestorius), Eutyehians (Eutychus), Theo-paschites (who said all the three persons of the Trinity suffered on the cross).

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SIXTH CENTURY: The Predestinarians, Incorruptibilists (who maintained that the body of Christ was incorruptible), the new Agnoet (who maintained that Christ did not know when the day of judgment would take place), and the Monothelites (who maintained that Christ had but one will).